as a sensor platform for drug interdiction. The UK's Ministry of Defence reportedly sent pilots to the US in early 1992 to evaluate the airship. In late 1993, the Sentinel 1000 became the first aircraft with fly-by-light controls to receive FAA certification and possibly the first such aircraft to be certificated anywhere. In 1993, Westinghouse was "still hopeful" that a prototype YEZ-2A would fly in 1998. The roles envisaged at this stage were "radar surveillance in support of U.S. Navy fleet operations and theatre missile-defence for the U.S. Army." The prototype would have been constructed at Moffett Field, California. On 2 August 1995, a fire, apparently started accidentally during welding work, destroyed the Weeksville hangar and its contents, including the sole Sentinel 1000 and the mock-up of the 5000's gondola. Despite the setback, work on the 5000 project continued, and the firm projected an airship somewhat larger than the 1000, the Sentinel 1240, which would have been capable of accommodating 40 passengers. Changes to the 5000's design were also proposed, including a simpler, single-deck, gondola and the replacement of the two gondola-mounted diesel engines and one turboprop with three Zoche diesels, two mounted on a beam spanning across the envelope and one at the tail. Both Moffett Field and Lakehurst were under consideration as construction locations. However, further plans were stymied by the sale of Westinghouse's defence-electronics business to Northrop Grumman in early 1996. Westinghouse Airships did not form part of this deal; its designs, patents, and other assets were subsequently acquired by British investor group London Wall, in a deal led by Roger Munk. Airship Technologies and its successors Airship Technologies The successor company became known as Airship Technologies. Advanced Technologies Group (ATG) Airship Technologies folded, to be succeeded by Advanced Technologies Group (ATG). Although ATG received two orders for the Skyship 600B, a higher-performance version of the 600, in its early years, it sold the type certificate for the 600 to Julian Benscher of Global Skyship and concentrated instead on a new product line. The firm constructed a solitary example of its AT-10 airship, a small non-rigid long with a gas volume of , i.e. somewhat less than half the Skyship 500's volume. It also projected unrealised non-rigids, such as the 50-seat AT-04, and undertook development work on a hybrid airship, the SkyCat. The SkyKitten, a 1/6 linear scale model of a SkyCat design, was built and flown